/***************************************************************************** * * File ..................: mbuseradd/sgetpwent.c * Purpose ...............: MBSE BBS Shadow Password Suite * Last modification date : 07-Feb-2001 * Original Source .......: Shadow Password Suite * Original Copyrioght ...: Julianne Frances Haugh and others. * ***************************************************************************** * Copyright (C) 1997-2001 * * Michiel Broek FIDO: 2:280/2802 * Beekmansbos 10 * 1971 BV IJmuiden * the Netherlands * * This file is part of MBSE BBS. * * This BBS is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * MBSE BBS is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with MBSE BBS; see the file COPYING. If not, write to the Free * Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. *****************************************************************************/ /* * Copyright 1989 - 1994, Julianne Frances Haugh * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Julianne F. Haugh nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "../config.h" #include <stdlib.h> #include <pwd.h> #include <string.h> #include "sgetpwent.h" #define NFIELDS 7 /* * sgetpwent - convert a string to a (struct passwd) * * sgetpwent() parses a string into the parts required for a password * structure. Strict checking is made for the UID and GID fields and * presence of the correct number of colons. Any failing tests result * in a NULL pointer being returned. * * NOTE: This function uses hard-coded string scanning functions for * performance reasons. I am going to come up with some conditional * compilation glarp to improve on this in the future. */ struct passwd * sgetpwent(const char *buf) { static struct passwd pwent; static char pwdbuf[1024]; register int i; register char *cp; char *ep; char *fields[NFIELDS]; /* * Copy the string to a static buffer so the pointers into * the password structure remain valid. */ if (strlen(buf) >= sizeof pwdbuf) return 0; strcpy(pwdbuf, buf); /* * Save a pointer to the start of each colon separated * field. The fields are converted into NUL terminated strings. */ for (cp = pwdbuf, i = 0;i < NFIELDS && cp;i++) { fields[i] = cp; while (*cp && *cp != ':') ++cp; if (*cp) *cp++ = '\0'; else cp = 0; } /* * There must be exactly NFIELDS colon separated fields or * the entry is invalid. Also, the UID and GID must be non-blank. */ if (i != NFIELDS || *fields[2] == '\0' || *fields[3] == '\0') return 0; /* * Each of the fields is converted the appropriate data type * and the result assigned to the password structure. If the * UID or GID does not convert to an integer value, a NULL * pointer is returned. */ pwent.pw_name = fields[0]; pwent.pw_passwd = fields[1]; if (fields[2][0] == '\0' || ((pwent.pw_uid = strtol (fields[2], &ep, 10)) == 0 && *ep)) { return 0; } if (fields[3][0] == '\0' || ((pwent.pw_gid = strtol (fields[3], &ep, 10)) == 0 && *ep)) { return 0; } #ifdef ATT_AGE cp = pwent.pw_passwd; while (*cp && *cp != ',') ++cp; if (*cp) { *cp++ = '\0'; pwent.pw_age = cp; } else { cp = 0; pwent.pw_age = ""; } #endif pwent.pw_gecos = fields[4]; #ifdef ATT_COMMENT pwent.pw_comment = ""; #endif pwent.pw_dir = fields[5]; pwent.pw_shell = fields[6]; return &pwent; }